HeliCoil Threaded Insert, Free-Running, Stainless Steel, Tanged, Course Thread, M8 x 1.25 Thread, 12mm Overall Length

Helical Screw Thread Inserts, commonly called by their trade-name Heli-Coil®, are inserts made from diamond shaped coiled wire. The insert is screwed into an internally threaded hole, and the internal surface of the insert provides a threaded surface that is stronger that the parent material. These inserts are usually used when the threads of an internally threaded hole are damaged.